Inconsistent formatting of code style in RSSminder post

[dreeves]

Desiderata

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1. Fix styling for line-wrapped code blocks

https://blog.beeminder.com/rssminder

Note what happens to the youtube.com/feeds/videos.xml?channel_id=UCASoR5UzKZZFiJ6gzE-ChWw at narrow screen sizes.

(Of course the full justification of the margins also looks horrible but that's a separate issue.)

Cognata

• Use HighlightJS for code blocks #356

Verbata: mobile-friendliness, responsive design, left/right justification, margins, texttt, code font, pre tags, css, highlightJS,